Draw your own.
What is cartography?
Here are the links from the pdf:
How To Make DIY Treasure Map | Easy Kids Crafts
How to Make a Map | Geography for Kids | Made by Red Cat Reading
Drawing a Fantasy Map (part 1)
There are 7 videos to making your map more details. This guy Nate is a wonderful resource if you’re into D&D mapping and Tolkien mapping.
How to Draw Mountains, Forests, Swamps and Cities for a Fantasy World Map!
JP Coovert, artist and gamer loves to teach map drawing.
Mr. Otter Art Studio
How to Shade in Pen
This channel has more mediums you might want to check out. But this is video is excellent ideas to add texture to your maps.